植物多样性 2018, 40(05) 245-252 DOI:   10.1016/j.pld.2018.09.002  ISSN: 2095-0845 CN: 53-1217/Q

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Cycas debaoensis
Coralloid root
cDNA library
Expressed sequence tags
Symbiosis and defense
SSRs
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PubMed
Generation and characterization of expressed sequence tags (ESTs) from coralloid root cDNA library of Cycas debaoensis
Yunhua Wang, Nan Li, Ting Chen, Yiqing Gong
Shenzhen Key Laboratory of Southern Subtropical Plant Diversity, Fairylake Botanical Garden, Shenzhen & Chinese Academy of Sciences, Shenzhen, 518004, Guangdong, China
摘要

A normalized full-length cDNA library was constructed from the coralloid roots of Cycas debaoensis by the DSN (duplex-specific nuclease) normalization method combined with the SMART (Switching Mechanism At 5' end of the RNA Transcript) technique. The titer of the original cDNA library was about 1.5×106 cfu·mL-1 and the average insertion size was about 1 kb with a high recombination rate (97%). The 5011 high-quality expressed sequence tags (ESTs) were obtained from 5393 randomly picked cDNA clones. Clustering and assembly of ESTs resulted in 2984 unique sequences, consisting of 618 contigs and 2366 singlets. EST sequence annotation revealed that 2333 and 1901 unigenes were functionally annotated in the NCBI non-redundant database and Swiss-Prot protein database, respectively. Functional analysis demonstrated that 1495 (50.1%) unigenes were associated with 4082 Gene Ontology (GO) terms. A total of 847 unigenes were grouped into 22 Cluster of Orthologous Groups (COG) functional categories. Based on the EST dataset, 22 ESTs that encoded putative receptor-like protein kinase (RLK) genes were screened. Furthermore, a total of 94 simple sequence repeats (SSRs) were discovered, of which 20 loci were successfully amplified in C. debaoensis. This study is the first EST analysis for the coralloid roots of C. debaoensis and provides a valuable genomic resource for novel gene discovery, gene expression and comparative genomics, conservation and management studies as well as applications in C. debaoensis and related cycad species.

关键词 Cycas debaoensis   Coralloid root   cDNA library   Expressed sequence tags   Symbiosis and defense   SSRs  
Generation and characterization of expressed sequence tags (ESTs) from coralloid root cDNA library of Cycas debaoensis
Yunhua Wang, Nan Li, Ting Chen, Yiqing Gong
Shenzhen Key Laboratory of Southern Subtropical Plant Diversity, Fairylake Botanical Garden, Shenzhen & Chinese Academy of Sciences, Shenzhen, 518004, Guangdong, China
Abstract:

A normalized full-length cDNA library was constructed from the coralloid roots of Cycas debaoensis by the DSN (duplex-specific nuclease) normalization method combined with the SMART (Switching Mechanism At 5' end of the RNA Transcript) technique. The titer of the original cDNA library was about 1.5×106 cfu·mL-1 and the average insertion size was about 1 kb with a high recombination rate (97%). The 5011 high-quality expressed sequence tags (ESTs) were obtained from 5393 randomly picked cDNA clones. Clustering and assembly of ESTs resulted in 2984 unique sequences, consisting of 618 contigs and 2366 singlets. EST sequence annotation revealed that 2333 and 1901 unigenes were functionally annotated in the NCBI non-redundant database and Swiss-Prot protein database, respectively. Functional analysis demonstrated that 1495 (50.1%) unigenes were associated with 4082 Gene Ontology (GO) terms. A total of 847 unigenes were grouped into 22 Cluster of Orthologous Groups (COG) functional categories. Based on the EST dataset, 22 ESTs that encoded putative receptor-like protein kinase (RLK) genes were screened. Furthermore, a total of 94 simple sequence repeats (SSRs) were discovered, of which 20 loci were successfully amplified in C. debaoensis. This study is the first EST analysis for the coralloid roots of C. debaoensis and provides a valuable genomic resource for novel gene discovery, gene expression and comparative genomics, conservation and management studies as well as applications in C. debaoensis and related cycad species.

Keywords: Cycas debaoensis   Coralloid root   cDNA library   Expressed sequence tags   Symbiosis and defense   SSRs  
收稿日期 2018-03-09 修回日期  网络版发布日期  
DOI: 10.1016/j.pld.2018.09.002
基金项目:

This work was supported by the Grant (201522) from Shenzhen Urban Management.

通讯作者: Yunhua Wang
作者简介: Nan Li,andreali1997@126.com;Ting Chen,reasl@126.com;Yiqing Gong,chuyulan126@126.com
作者Email: 76wasir@163.com

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